Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 57, NWS Buffalo, NY

July 8, 20214 counties in New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jul 8, 2021, 4:13 PM EDT for 4 counties in New York. It was in force for 32 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 8, 2021, 4:13 PM EDT (20:13 UTC)
Expired: Jul 8, 2021, 4:45 PM EDT
In force: 32 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 70.0 mph

Counties Erie County, NY, Genesee County, NY, Niagara County, NY, Orleans County, NY

The radar

The Buffalo radar (KBUF), 28 km from the middle of the area, began a volume at 20:13 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Jul 8, 4:13 PM EDT	TSTM WND DMG	1 Wnw Akron, NY	TREES DOWN REPORTED BY LOCAL MEDIA IN NEWSTEAD.
Jul 8, 4:13 PM EDT	TSTM WND DMG	3 N Akron, NY	MULTIPLE DOWNED TREES.
Jul 8, 4:36 PM EDT	TSTM WND DMG	2 N Elba, NY	TREE WITH WIRES DOWN ON LOCKPORT RD NEAR ELBA.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 8.2 hours before the alert went out and 26 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 99 J/kg
Mixed-layer CIN: -128 J/kg
Mixed-layer LCL: 725 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

900 
WUUS51 KBUF 082013
SVRBUF
NYC029-037-063-073-082115-
/O.NEW.KBUF.SV.W.0057.210708T2013Z-210708T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
413 PM EDT Thu Jul 8 2021

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Northeastern Erie County in western New York...
  East central Niagara County in western New York...
  Southern Orleans County in western New York...
  Genesee County in western New York...

* Until 515 PM EDT..

* At 412 PM EDT, a severe thunderstorm was located near Akron, or 8
  miles northeast of Clarence, moving east at 35 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Clarence, Batavia, Lancaster, Darien Lakes State Park, Pembroke,
  Akron, Alden, Attica, Oakfield and Clarendon.

 This includes Interstate 90 between exits 48A and 48.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4288 7867 4317 7851 4324 7806 4287 7809
TIME...MOT...LOC 2012Z 270DEG 28KT 4308 7850 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...70MPH
 
$$

HSK

2 follow-up statements

058 
WWUS51 KBUF 082031
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
431 PM EDT Thu Jul 8 2021

NYC029-063-082040-
/O.CAN.KBUF.SV.W.0057.000000T0000Z-210708T2115Z/
Erie NY-Niagara NY-
431 PM EDT Thu Jul 8 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ERIE AND EAST
CENTRAL NIAGARA COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4288 7846 4320 7833 4324 7806 4287 7809
TIME...MOT...LOC 2030Z 277DEG 30KT 4304 7827 

$$

NYC037-073-082115-
/O.CON.KBUF.SV.W.0057.000000T0000Z-210708T2115Z/
Orleans NY-Genesee NY-
431 PM EDT Thu Jul 8 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR SOUTHEASTERN ORLEANS AND CENTRAL GENESEE COUNTIES...

At 430 PM EDT, a severe thunderstorm was located over Oakfield, or
near Batavia, moving east at 35 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Batavia, Darien Lakes State Park, Attica, Oakfield, Clarendon, Corfu,
Elba, Alexander, East Bethany and Barre Center.

 This includes Interstate 90 near exit 48.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4288 7846 4320 7833 4324 7806 4287 7809
TIME...MOT...LOC 2030Z 277DEG 30KT 4304 7827 

HAIL...<.75IN
WIND...70MPH
 
$$

HSK

615 
WWUS51 KBUF 082045 RRA
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
445 PM EDT Thu Jul 8 2021

NYC037-073-082055-
/O.CAN.KBUF.SV.W.0057.000000T0000Z-210708T2115Z/
Orleans NY-Genesee NY-
445 PM EDT Thu Jul 8 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ORLEANS AND
CENTRAL GENESEE COUNTIES IS CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.  However heavy rain is still possible with this
thunderstorm.

LAT...LON 4288 7846 4320 7833 4324 7806 4287 7809
TIME...MOT...LOC 2044Z 270DEG 28KT 4304 7810 

$$

HSK

The office that day

Everything else NWS Buffalo, NY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 7, 8:04 PM EDT	Special Weather Statement	BUF	Allegany, Cattaraugus, Chautauqua	56 min
Jul 7, 8:39 PM EDT	Flash Flood Warning	BUF	Allegany	3 hr
Jul 8, 12:48 PM EDT	Special Weather Statement	BUF	Niagara	27 min
Jul 8, 1:40 PM EDT	Special Weather Statement	BUF	Niagara	35 min
Jul 8, 2:18 PM EDT	Special Weather Statement	BUF	Orleans	42 min
Jul 8, 3:08 PM EDT	Special Weather Statement	BUF	Niagara	67 min
Jul 8, 3:23 PM EDT	Special Marine Warning	BUF		37 min
Jul 8, 3:34 PM EDT	Special Weather Statement	BUF	Erie	41 min
Jul 8, 3:41 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Niagara	48 min
Jul 8, 3:48 PM EDT	Special Marine Warning	BUF		57 min
Jul 8, 4:16 PM EDT	Special Weather Statement	BUF	Oswego	44 min
Jul 8, 4:26 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis, Oswego	49 min
Jul 8, 4:29 PM EDT	Special Weather Statement	BUF	Monroe	61 min
Jul 8, 4:37 PM EDT	Special Marine Warning	BUF		53 min
Jul 8, 4:45 PM EDT	Special Weather Statement	BUF	Genesee, Monroe	30 min
Jul 8, 4:53 PM EDT	Flash Flood Warning	BUF	Monroe, Wayne	3 hr
Jul 8, 5:09 PM EDT	Special Weather Statement	BUF	Lewis	51 min
Jul 8, 5:12 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis, Oswego	63 min
Jul 8, 6:15 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis	60 min
Jul 8, 7:52 PM EDT	Special Weather Statement	BUF	Lewis	38 min

Nearby

Severe Thunderstorm Warnings in New York, 2021 Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.